Power Injector for PoE Networks

A Power Injector for PoE (Power over Ethernet) networks is a device that injects power into an Ethernet cable, enabling devices like IP cameras, wireless access points, and VoIP phones to receive both data and power over a single cable. Here is a general specification for a typical Power Injector used in PoE networks:

General Specifications:

• Power Output:

  • PoE (IEEE 802.3af): Typically provides up to 15.4W per port over Cat5/Cat6 cables.

  • PoE+ (IEEE 802.3at): Provides up to 25.5W per port.

  • PoE++ (IEEE 802.3bt): Provides up to 60W (Type 3) or 100W (Type 4) per port.

• Input Voltage:

  • AC input: 100-240V AC (50-60 Hz) for universal compatibility.

  • DC output: Typically 48V DC to power connected PoE devices.

• Ports:

  • Commonly 1 input port for connecting to the network and 1 or more output ports (usually 1 to 4) for providing PoE.

  • Gigabit Ethernet Ports (10/100/1000 Mbps), though some older models may only support 10/100 Mbps.

• Power Delivery Type:

  • IEEE 802.3af: Suitable for basic devices such as IP cameras or basic VoIP phones.

  • IEEE 802.3at (PoE+): Suitable for high-power devices such as wireless access points or advanced VoIP phones.

  • IEEE 802.3bt (PoE++ or 4PPoE): For devices requiring higher power such as PTZ (Pan-Tilt-Zoom) IP cameras, large wireless access points, or digital signage.

• Power Consumption:

  • The injector itself typically consumes a small amount of power to deliver the required output power to the connected devices. This is usually between 10W to 50W depending on the injector type and number of ports.

• Mounting:

  • Many power injectors are desktop mountable but some can be wall-mounted or rack-mounted depending on the design and intended use case.

• Ethernet Cable Compatibility:

  • Compatible with standard Cat5, Cat5e, Cat6 cables for both data transmission and power delivery.

• Indicators:

  • LED indicators to show power status, PoE status, and network connectivity.

• Safety Features:

  • Short-circuit protection

  • Overcurrent protection

  • Overvoltage protection

  • Overtemperature protection

• Certifications:

  • Common certifications include UL, CE, FCC, and RoHS compliance.

Typical Use Cases:

• IP Cameras: Allowing IP cameras to be powered over the same Ethernet cable used for data transmission.

• VoIP Phones: Simplifying installation by delivering power and data over one Ethernet cable.

• Wireless Access Points: Enabling Wi-Fi access points to be powered via Ethernet cables in locations without a nearby power source.

• Network Devices: Other networking equipment like IP phones, network routers, and hubs.

Example Model:

• TP-Link TL-PoE150S: A popular PoE injector supporting IEEE 802.3af.

  • Output: 48V DC, up to 15.4W per port.

  • Input: 100-240V AC.

  • Ports: 1 Input, 1 Output.

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